Improvement in locks



PATENT OFFICE.

WILLiAM HALL, or Baookmnn, MASSACHUSETTS.

IMPROVEMENT |N Looks.

Spccilicai ion forming part of Letters Patent No. 41,8 l 7, dated Mayfi,le'.

Too/ZZ whom, t may concern:

Be it known that I, WM. HALL, 'ot' Brookline, in the countyof Norfolkand State of Massachusetts, have invented an Improvement in Locks,'ofwhich the following is a specilication.

The nature of my invention consists in certain improvcmentsinregisterlocks, to this-et'- i'eot, tirst, by securing the hub to thecase of the lock by nieans of a right and left hand screw; second,guarding against pressing the stump against the cog wheels; third,holding the bolt in position while the cog-wheels are being set; fourth,adjusting the lock to the door by means of the hollow.adjusting-screws.

To enable others'skilled in the art to make and use my invention, I willproceed to describe it, reference being had to the accompanying drawingsand to the letters ot' reference marked thereon.

Similar letters refer to similar parts.

a b c d in Drawings Nos. 1 and 2 rep'resentcase of lock; B, bolt; S andS', stump divided into two parts. The partSis attached to theboltB 'bythe screw Oland swin gs freelyon the screw. That part of the stumpdesignated S" is atcached to the plate s. (Shown on drawings 5 and 6.)Plate s is confined by means of the screw Within the groove made forthat purpose in the bolt in Such a manner as to admit -ofa slightsliding motion inthe direction of the length of the bolt-B. Bythisdevice it will be seen that the bolt B may be pushed back a shortdistance, while the part S' of the stump may remain stationary, thuscausing the part S ofthe stump to swing up, carrying with it the dog Dinto the notch ef. The object of this arrangement is to prevent theoperator upon the lock from feeling the openings X in the wheels W- lVW, Drawings 2 and 5 all operation which is performed .by getting aslight pressure on the bolt to push it back. Then turnin g the knob Kslowly, any motion of the bolt B indicates that the opening X of someone of the wheels W WW has probably come intoposition. Bythis'arrangement any such Vpressure upon the bolt B will have thetendency to slide the part S against the part S., thus raisingit up andbringing the dog D (permanently attached to S) into the notch e j',Drawings 2, 5, and 6, thus eii'ectually preventing any further mo tionof the bolt B.

W W W in all the drawings, except 3 and 4, are cog-wheels with openingsX,into which n the stump S S may slide when the wheels are all broughtinto position.

rw w w 'in all the drawings, except 4, are

cog-wheels, which may be revolved by means of the knob K. o

lf in Drawings 3 and 4 is adiskvpermanently attached to the spindle ofthe knob K.

P in Drawings Sand 4 isa pin in the disk G.

P P P" are pins in the cog.wheels ww u. The four pins-wiz., l P Bl P-.I-are so placed l`that no one of the wheelsww w or the disk G can make acomplete revolution without bringing the pin of some wheel in contactwith the pin of another. Thus, if we revolve the knob K (which turns thedisk (lr) the pin Pot the disk G will come in contact with the pin P andwill cause the first wheel to revolve. The pin P', coming in contactwith the piu P of the second wheel, will cause that to'revolve.

The same operation continued willrca'use the third wheel to revolve.v f

The set of cog-wheels XV W W may 'be thrown out of gear from the wheelsw w w by means of the key T.

The key T serves a double purpose4-viz.,that I of throwing thecog-wheels out of gear by aeting upon the vibrating plate V, DrawingsNo.

5 and 6, which hinges upon the screw Z, Draw- 1n gs No. 5 and 6, andupon which the cog-\vl1'eels are hung, and at the same time raising thelever L up into the notch c, Drawings 5 and 6, of the bolt B, for thepurpose of holding the bolt immovable while the wheels w w w are out ofgear and are being set by the register.

K in Dra-wings'l and 4 is a disk fixed to the knob K, with edgegraduated by means of small black lines into ifty 'equal parts.l Thesedivisional l-ines are numbered.

B. iu Drawings l. andl 4 is a disk xed per-- manently to the lock. Thisdisk has but one mark, r, uponit.

To illustrate the use of thispart of the lock, I will proceed todescribe the method of ad; justing the cog-wheels w w w and of using thelock in actual practice. To adjust the wheels fw 'w w (first premisingit to be unlocked) by means of a key, I turn the key T, throwing uplatch L, fastening the bolt `B in position, and throwing the cog-wheelsW W W out of gear, .thus leaving the cog-wheels 'w fw fw and the knobK,which is indirectly attached to` them, free to revolve. I then turnthe knob ar y t I 47,817

K to the right until all the wheels w w 1v are revolving together; thenset the disk K so that any number on it-, for instance-coincides withthe mark r on the disk 1t; then revolve the knob K and disk K vin anopposite direction more than twice, but less than three times, and setany division-#say 45E-4to coincide with the mark r; reverse the mo--tion again, revolve thekuob and disk until the cog-wheels begin tomove, (which will be indicated by the feeling,) but always less thantwice, and setA any division-say .5U- to coincide with the mark r. Thelock is now set on 5, 45, and 50 ,jf-throw the bolt out by pullingtheknob K toward you and turning it to the left; let the knob springback, and revolve it each way two or three times. To unlock it, I turntherknob to the. right till all three wheels are revolvingrtogetherjthen bring division 5 ot' the disk l yto coincide with the markr; then turn to the left more than twice, but less than three times, andbring division 45 oi disk K tocoin'cide with mark r; reverse the motionagain and turn the knob K till the wheels begin -to revolve, but alwaysless than twice; bring division 50 to coincide with mark r; pull theknob K toward you, (which will bring the teethot the cog-wheel M intotheratchet N, Drawings,) and the-n turn to the right, drawing Athe bolt in.

.l is a bar, hinged at one end to the bolt, the surface of which backtoward its free end is held in contact with the disk (r by a spiralspring, I, interposed between the tail ot' the bolt and the bar, thepurpose ot' all which is to force the disk l( back into its socket lltso soon as the handlreleases its hold upon the knob.I

M in Drawings 1 and 3 is a small cog-wheel attached to disk Gr andrevolving with it. It acts against ratchet N, which is a part of thebolt B. (Shown in Drawing lout oi? gear.)

g g g g in Drawings v1, 3, 5, and 6 are hollow screws for the purpose ofadjusting the lock to the iron door. They have slots cut across the endw'ithin the lock to take a screwdriver.

l Hin Drawings 3 and lis the hub; H', ri ght-hand screw cut on the shankof the hub H; H", left-hand screw, upon which the checknut U is screwed.The advantage of this arrangement is that the hub H having been screwedinto thc case of the lock, and the check-nut U screwed upon it, the hubcannot be started from the outside.

V V V in Drawings 1 and 3 three brakes, acting upon the cog-wheels w ww, for the purpose ot' holding them steadily in position.

What I claim as my invention, and desire to seeureby Letters Patent, is-

' 1. Fastening the hub by means of the righthand screw H through thecase of the lock, and the left-hand screw H, or vice versa, combinedwith the check-nut U.

Making the stump in two parts, S and S.

3. The peculiar arrangement ot' the lever L and the key T, so that atthe time the cog wheels are thrown out of gear the bolt shall beimmovable.

4. rlhe hollow adjustiug'screws g g g g,

all of which operate substantially as described, and for the purpose-setforth.

WM. HALL.

Witnesses WILLIAM EDsoN,

tnA A. GAunrNER.

